多枝柽柳(Tamarix ramosissima)根、冠构型的年龄差异及其适应意义

doi:10.7522/j.issn.1000-694X.2014.00015

摘要/Abstract

摘要：

根、冠构型差异是植物研究中容易被忽视的环节,但其在植物适应环境的过程中扮演着重要角色。对不同林龄多枝柽柳(Tamarix ramosissima)根、冠构型参数的调查研究表明:(1)不同林龄多枝柽柳冠层构型有较大的差异,幼年阶段多枝柽柳小枝分枝率和一级分支长度较小,各级分支直径较大,体现了其适应强风、干旱环境的可塑性变化; (2)随着林龄的增加,多枝柽柳分支率、根系连接长度、各级根系长度和直径明显增加,说明不同生长阶段多枝柽柳通过权衡碳消耗和碳分配采取不同的干旱适应策略,进而导致不同生长阶段干旱适应能力的差异; (3)不同林龄多枝柽柳根系拓扑结构参数无明显差异,均接近鲱鱼骨状分布,但根系连接长度差异显著,体现了其干旱适应能力的差异。

关键词: 冠层构型, 根系构型, 根系拓扑结构, 环境适应性, 分支结构

Abstract:

Although the importance of plant architecture was underscored on plants adaptation to environment, little attention was paid on it while doing plant research. Here, field sampling and investigation were taken to show both the shoot and root architectural plasticity of Tamarix ramosissima of different ages. The results showed that T. ramosissima of different ages performed significant differences on shoot and root structure. Young individuals possessed smaller branch bifurcation ratio, shorter first order branch and coarser branch diameter which benefitted to their adaption to drought and wind stress. The root bifurcation ratio, average linking length, length and diameter of different orders increased significantly by ages, suggesting that there's a certain tradeoff of carbon consumption and distribution strategy among T. ramosissima individuals of different ages. Roots of all T. ramosissima individuals formed a herringbone pattern, and the topological parameters of T. ramosissima in different age didn't differ much.

Key words: shoot architecture, root architecture, root topology, environment adaptation, bifurcation structure

中图分类号:

Q944.3

李尝君, 郭京衡, 曾凡江, 热甫开提, 郭自春. 多枝柽柳(Tamarix ramosissima)根、冠构型的年龄差异及其适应意义[J]. 中国沙漠, 2015, 35(2): 365-372.

Li Changjun, Guo Jingheng, Zeng Fanjiang, Refkat, Guo Zichun. Shoot and Root Architectural Variance and Adaptability of Tamarix ramosissima in Different Ages[J]. JOURNAL OF DESERT RESEARCH, 2015, 35(2): 365-372.

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